The end user would be a small remote community, that derives their electricity from wind or solar power and are not necessarily connected to a grid.
Not had much luck with manufacturers.
The motor-generator will be used to pull a load up a mountain side/steep incline on a rail system, the load is between 10 and 300 tonnes, its for a gravitational potential energy storage system. Excess electricity pulls the load up the incline, when there is demand for electricity the load is...